FAULT PLANE SOLUTION FORMAT
--------------------------
This document is maintained by David Oppenheimer May 20, 1993
The format of the fault plane solutions produced by FPFIT are HYPO71 summary
cards in columns 1-80 augmented with the fault-plane solution parameters. The
FORTRAN formats below are to be used for reading the fields. For more
information see
Reasenberg, P. A., and D. Oppenheimer, 1985, FPFIT, FPPLOT, and FPPAGE:
Fortran computer programs for calculating and displaying earthquake
fault-plane solutions, U.S. Geol. Surv. Open-File Rep. 85-739.
Cols. Format Data
_____ ______ ____
1-6 3I2, 1X Year, month and day.
8-11 2I2 Hour and minute.
12-17 F6.2 Origin time seconds.
18-20 F3.0 Latitude (deg).
21 A1 S for south, blank otherwise.
22-26 F5.2 Latitude (min).
27-30 F4.0 Longitude (deg).
31 A1 E for east, blank otherwise.
32-36 F5.2 Longitude (min).
37-43 F7.2, 2X Depth (km).
46-50 F5.2 Magnitude. See col. 80 for code
51-53 I3 Number of P & S times with weights greater than 0.1.
54-57 F4.0 Maximum azimuthal gap.
58-62 F5.1 Distance to nearest station (km).
63-67 F5.2 RMS travel time residual.
68-72 F5.1 Horizontal error (km).
73-77 F5.1, 2X Vertical error (km).
80 A1, 1X If data source is Hypoinverse, then code designates type of
magnitude posted in cols. 46-50. L=ML based on above location,
B=ML from UC Berkeley, C=coda, A=amplitude
82-84 F3.0, 1X Dip direction (downdip azimuth in degrees,clockwise from north)
86-87 F2.0 Dip angle in degrees down from horizontal
88-91 F4.0, 2X Rake in degrees: 0=left lateral, 90=reverse, +-180=right
lateral, -90=normal
94-97 F4.2, 1X Solution misfit value. 0=perfect fit, 1=perfect misfit (never
exceeds 0.5 in reality).
99-101 I3, 1X Number of first motion observations used in solution
103-107 F5.2, 1X Solution misfit value + 90% confidence estimate. Useful for
testing whether restricted solutions are within uncertainty
region of free solution
109-112 F4.2, 1X Station distribution ratio (0-1). Lower numbers indicate
data lie near nodal planes.
114-117 F4.2, 2X (# of machine picks)/(# of hand picks)
120-121 F2.0, 1X ~90% confidence range of strike
123-124 F2.0, 1X ~90% confidence range of dip
126-127 F2.0 ~90% confidence range of rake
128 A1 Convergence flag: C=no convergence; otherwise blank
129 A1 Multiple solution flag: *=multiple; otherwise blank
130-139 I10 Event ID # found in Hypoinverse archive file